
#include<stdio.h>
#include"mymath.h"
#include"mystring.h"
int main()
{
    int a = 10;
    int b = 20;
    char* str = "hello linux";
    int c = add(a,b);
    int d = subtract(a,b);
    int sz = mystrlen(str);
    printf("add:%d,sub:%d,sz:%d\n",c,d,sz);
    return 0;
}